Non Separable Two Dimensional Discrete Wavelet Transform for Image Signals
Masahiro Iwahashi, Hitoshi Kiy · InTech eBooks · 2013
X(21for X and Y in (14).Finally, the non-separable 2D 5/3 DWT is constructed as illustrated in Fig. 6.It has 3 lifting steps in total.The total number of lifting steps (= latency) is reduced from 4 (100%) to 3 (75%) as summarized in table 1 (separable lossy 5/3).Signal processing of each lifting step is equivalent to the interpolation illustrated in Fig. 7.In the 2nd step, two interpolations can be simultaneously performed with parallel processing.Note that the non-separable 2D DWT requires 2D memory accessing.